# NCO- Cyber Olympiad (SOF) Class 7: Questions 141 - 144 of 417

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## Question number: 141

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MCQ▾

### Question

If and be any two rational numbers then we define:

Thus, subtracting a rational number means adding its additive inverse. Based on the statement given above solve the following Problem: Subtract from .

### Choices

Choice (4)Response

a.

b.

c.

d.

## Question number: 142

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MCQ▾

### Question

Two positions of a dice are shown below. When there are 3 circles at the button, the number of circles at the button will be

### Choices

Choice (4)Response

a.

4

b.

5

c.

6

d.

1

## Question number: 143

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Match List-Ⅰ List-Ⅱ▾

### Question

Match the following.

 List-Ⅰ List-Ⅱ (A)Circumcenter (i)The point at which the altitudes of a triangle meet (B)In Centre (ii)The point at which the three angle bisectors of a triangle meet (C)Centroid (iii)The point of intersection of the perpendicular of the sides of a triangle (D)Orthocenter (iv)The point at which the medians of a triangle meet

### Choices

Choice (4)Response
• (A)
• (B)
• (C)
• (D)

a.

• (iii)
• (ii)
• (iv)
• (i)

b.

• (i)
• (ii)
• (iv)
• (iii)

c.

• (ii)
• (iv)
• (iii)
• (i)

d.

• (iv)
• (i)
• (ii)
• (iii)

## Question number: 144

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MCQ▾

### Question

A train 600 meters long is running at a speed of If it crosses a tunnel in 1 minute, then the length of the tunnel (in meters) is.

### Choices

Choice (4)Response

a.

130

b.

360

c.

300

d.

500

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